Safety control device



July s, 1924. 1,500,403

H. H. LOGAN SAFETY -coNTRoL DEVI CE Filed Aug. 2. 1923 /Y// @dan Patented July 8, 17924.

HENRY LOGAN, OF CHICAGO, ILLINOIS.

SAFETY CONTROL DEVICE.`

Application led .August 2, 1923. Serial No.,655,322.

T all whom t may concern: n

Be it known that HENRY H. LOGAN, a citizen of Great Brita-in, who has declared his intention of becoming a citizen of the United States, and a resident of* Chicago, infthe county of Cook and State -of Illinois, has invented a new and useful Improvement in A Safety Control Devices, of which the following is a full, clear, and exact description.

My invention relates'to improvements in safety control devices, and it consists in the combinations, constructions', and arrangei ments herein described .and claimed.

This application is a continuation in` part l" of my application for safety control device,

vSerial No. 517,602, filed November 25, 1921, and allowed July 7, 1923, which has matured into Patent No. 1,480,170, JanuaryS, 1924. This application showsa safety control device which comprises a brake that is adapted to be automatically applied to-a hoisting mechanism when the car reaches a predetermined point in its ascent and descent; and novelV means for applying the brake instantly ory gradually-so'as tov bring the car to an abrupt stop orto a slow stop. The

'move" downwardlyI rapidly or slowly has -novel means for actuating the brakequickly or slowly was` claimed in my co-pending application. The present application is especially directed `to the releasing mechanism for the brake. f

' An object of my invention is to provide a braking mechanism which is electrically operated, the releasing mechanism being constructed so as to hold a'relatively great weight with but little force being required to hold the weight in'its uppermost position.

-A further object of my invention is vto provide a device of the character described VwhichV is adapted to instantly-releasev the weightassoon as the current has been shut Og f.^ .m

A- further object Vof my invention is to provide-a device of the character described in which 'the Vcontrol mechanism and the braking mechanism are mounted on asingle base.

A further object of my invention is to provideV a'device 'of the character described which is simple in construction and which may' be" readily connected toa hoisting mechanism with but slight alterationsbeing necessary' in the latter. V i Y Other objects and advantages will appear in the, following specification, and the novel features of the invention will be i particularly claims. Y

VMy inventionl isillustrated in the accompanying-drawings, forming part of this application, in which- Figure l isa side elevation of the device, Figure2 is a frontelevation of the upper pointed out in the appended portion of the device, and Y Figure 3 is a vertical section through they oil, cylinder control.v

In carrying ,out my inventioml providel a base 1 which carries a'shaft'2, the shaft -being connected tothe braking mechanism of Vahoist (not shown), whereby a partialrotation of the shaft willy apply the brakes to the hoisting mechanism.' An arm. 3 is rigidly'secured to the shaft12 and carries a weight 4 at itsfree end. The weightl 4 is adapted to 'drop from the full line position to the dotted line position when the arm 3 isreleased by a mechanism hereinafter described. The movement of the weight 4 into its lowermost position applies the brake to thehoisting mechanism. Y The vmeans for causing the weightl 4 to been clearly' described andclai-med linmy 2o-pending application, Serial No.'517,602, and therefore needs but ageneral descriptionV in the present application. This mecha,-

nism comprises 'an oil cylinder 5 that is pivotally mounted to the base 1 at 6, and which carries a piston rod-7A that isconnectedto the arm` 3.l A valve, indicated generally at 8,when closed is adapted to permit the arm 3 and :weight 4 to move downwardly slowly, and when open, to permit a rapiddescent.

A. camV -91is15mountedupon the base 1 and isVV adaptedfto turn through an 'approxi mate'complete revolution during the entire *movement of the car that Tis actuated by the .hoistingmecl1anism. Lugs 10 and 11 are moved by either of the lugs 10 or 11, the current to the hoist actuating mechanism is out off, whereby the weight 4 is released.

Means for holding the weight in raised position'and for instantly releasing the weight when the current is cut o, is clearly shown in Figure 1. A lever 17 is pivotally secured at 18 to a frame 19, that in turn is carried by the base 1. The lever 17'has a recess 2() therein which is adapted to receive a hook 21 which is carried by the arm 3. The lever 17 when-in closed position is disposed in such a position that it can withstand a relatively great pulling force withouty 'being rotated about the pin 18. With this kconstruction a very small retaining force can be used Jfor supporting a'relatively great weight. The lever 17 is'connected to an arm 22 by means of a link 23. Here again it will be noted that the link 23 and arm 22 are disposed substantially at right angles to the lever 17 so that the arm 22 can withstand great pull upon the link 23 withoutrequiring much 'force to hold the arm 22 in closed position.

A small magnet 24 is employed for holding the arm 22 in closed position. This magnet 24 is preferably connected in either 'of two ways, i. e., lirst in series with the oil switch (not shown), or with a circuit breaker (not shown), or by a switch operated by the governor X on the controller, whereby an overload, a failure of the current, or the opening of the circuit breaker or governor operated switch will de-energize the magnet; and second, in series with a'switch (not shown) which' is operated by the cam 9. The magnet is also in series with a plurality o,

switch boxes (not shown) which are disposed along the line of travelo the cage, one of the switches being disposed in the cage itself so as to be readily actuated by the person within the cage. When the current to the magnet 24 is cut off by any one of the foregoing ways, the weight 4 will cause the arm 22 to swing into the dotted line position, `whereupon the weight will be released from the recess 20. Y The piston 7 will now regulate the speed of the weight 4 Vin its downward movement. y

From the' foregoing description' of the various' parts of the device, the `operation thereof may be readily understood. Nhen `the Weight 4 is released Vbefore the cage is vat the end `of its movement either in an upward'or downward direction, the valve 8 will be Aclosed so as to cause the weight 4 to move downwardly slowly and'to gradually apply the brakes. The closing of the valve 8 kat this time is due to the disengagement of the cams 10 and 11 'with thecam arm 12` which is connected to the valve through the connecting rod and levers 14, 15, and 16, re-

spectively. VVhen'the cage is near its uppermost or lowermost position, the weight 4 when *releasedv will quickly apply the brakes the releasing mechanism are mounted upon a single base, the device may be readily connected to the hoisting mechanism in a mmimum length of time. The weight 4 carries a switch member 25 that is adapted to 'contact with the switch member 26 when the weight is in its uppermost position. This master control switch is openV when the weight 4 drops into its lowermost position. The device may be readily reset after once being actuated. This is accomplishedl by merely swinging the weight 4 from the dotted line position into the full line position, the hookl 21 engaging with the lever 7 during this movement so vas to swing the lever into its closed position. The magnet 24 is'now adapted to hold the arm 22 in closed position.

The device is very simple in construction and provides a novel means for automatically controlling the cage. The device is adapted to automatically stop the movement of the cage incase the'engineer who is controlling the devicer is careless or through aecident is unable to operate the control mechanism. The device is also adapted to stop the cage in case an accident happens to the actuating mechanism. or-V in case the cage is not retarded soon `'enough at the Yendoi't its movement. The vdevice is combinedv into a single unit and can therefore beV readily moved when desired.

The piston rod has a piston 27 mounted thereon the pistn having a plurality of vlarge openings l28V therein. vA springpegggd the piston starts on its downward movement.V

I claim: I v l. A. device of the type describedcmprisinga support, a shaft carried by said support, 'a' weighted'arm4 rigidly secured `to saids-hait't',v a magnet, a' plate p'ivoftallyca-rL ried by' saidl support and adapted 'to 'contact with said magnetland tobe held against movement when 'said magnet is'energi'zed, a second iarm 'pvotally carried by said sup- 4secured to said shaft, a second arm pivotally carried by said support, a magnet adapted to lock said second named arm against movementwhen said magnet is energized, said second named armhaving a recess therein, aV hook carried by ,said weighted arm and adapted to cbe received in the recess of said'second named arm, and means for controlling the movement of said weighted arm when said weighted arm is released by said second named arm.

v3. A device of the type described comprising a support, a shaft rotatably mounted in said support, a weighted gravity actu- 1 ated arm rigidly secured to said shaft, and an electrically controlled locking means vfor normally preventing the movement of said arm except when released by said locking means. f n

4. A device of the typeV described co-mprising a support, ashaft rotatably mo-unted in said sup-port, a weighted gravity actuated arm rigidly secured to said shaft, and an electrically controlled locking means for normally preventing the movement of said arm except when released by ysaid locking means, said controllin means being adapted to permit said weighted arm to swing rapidly or slowly.

5. A device of the type described comprising a support, a shaft rotatably mounted in said support, a weighted arm rigidly secured to `said shaiit, a secondv arm pivotally carried -by' said support, a magnet adapted to lock said second named arm against movement when said magnet is energized, said second named arm having a recess therein, a hook carried by said weighted arm and adapted to be received in the recess of said second named arm, and means for controlling the movement of said weighted arm when said weighted arm is released by said second named arm, said controlling means being adapted to permit said weighted arm 'to swing rapidly or slowly.

6. A device of the type described co-mprising a support, aI shaft rotatably mounted in said support, a weighted gravity actuated arm rigidly secured to said shaft, an electrically controlled locking means Afor normally preventing the movement of said arm, a cylinder pivotally carried by said support, said cylinder having a fluid therein, and a piston disposed in said cylinder and operatively connected to said arm, said piston having a small opening ltherein for the passage of the uid therethrough, whereby said piston will slowly move downwardly in said cylinder Vwhen said arm is released by said lockingmeans.

7. A device of the type Vdescribed prising a support, a shaft rotatably mounted in saidsupport, a weighted gravity' actuated' arm rigidly secured to said shaft, an

electrically controlled locking means for normally preventing the movement of said arm, a cylinder pivotally `carried by said in, and a piston disposed in said cylinder and operatively connected to said arm, said piston "having a small opening therein for" the passage of the fluid' therethrough, whereby said piston will slowly move downwardly in said cylinder when said varm'is released b-y said locking means, and means for permitting the piston to move rapidly" downward in said cylinder. A

8. A device of the type 'described comsupport, said cylinder having a. Huid thereprising a support, a shaft rotatably mounted insaid support, a weighted gravity actnated arm rigidly 'secured toV said shaft, an

electrically controlled locking means for normally preventing the movement of said arm, a cylinder pivotally carried byV Said support, said cylinder havinga fluid theresaid piston will slowly move downwardly in said cylinder when said arm is released by said locking means, a bore in the wall of said cylinder and communicating with the top and bottom of said cylinder, and an automatically controlled valve disposed in the bore.

9. In a device of the type described, a support, a magnet carried by said support, a plate pivotally carried by said support and adapted to abut said magnet and to be prevented from movement when said magnet is energized, an arm pivotally carried by said support, said arm having a recess therein, a link connecting said arm with said plate, a movable member, anda hook 'carried by said movable member and adapted to be received in the recess of said arm/ 10. A device of the type described comprising a support, a weighted gravity actuated arm pivotally carried by said Vsupport, an electrically controlled locking means adapted to normally prevent. said vin,'a piston-disposed in said-cylinder and Voperatively connected to said arm, said pisi ton 'having a small opening therein for the vpassage of the fluid therethrough, whereby llO arm from movement, and means for conswitch member carriedby saidsupport, said switch members being adapted to contact yWithfeach Vother when Said 'arm is held by said locking means `and to disengageJ each A other When saidl'ocling means has been opened.

' 12. In a device offthe 'type-described, va support, an arm' pivotally' carried by said support, said arm having a recess therein, a Weighted gravity actuated arm pivotally carried by said support, a hook carried by said second named arm and adapted to be received in-the recess of said first named arm, means for locking saidV first named arm from movement, said first named arm having a curved portion adjacenty to ythe recess, said curved portion being adapted to force said hook out of engagement Withy the recess When said first named arm is released by'said locking means.

13. A device of the ftype described comprising a support, a lbrake engaging member carried by said support, meanscarried by said support for releasing said member, means carried by said support forfcontrollling the movement of said member afterit has vbeen released, and means also" carried 'by said "support for `actuating the control hoisting drum.

arm, means carried by saidsupport for releasing said arm, and means carried by said support for adpistingsaid control means to determine the speed at which the arm moves.

15. The combination With a brake mechanism, of amine hoist, and a hoisting drum for said hoist, of a support, a gravity operated `brake engaging lmember `carried by said support and arranged to 'connect directried by said support yfor lockingysaid member against movement,-and means carried by 'said support arranged to cooperate With said hoisting drum with which said brake mechly with said brake mechanism, means caranism is associatedfor releasing said lock-.VY

ing means when'said hoisting drum over- .soeiated therewith 'arranged to function when said hoisting drum overspeeds or over- Winds, of hydrauliemeans for controlling the movement of said automatic brake aplying means to cause the brakes to be ap plied at` a variable lrate of speed, and means cooperating with the hoisting drum andassociated with the hydraulic means to automatically control the hydrauliemeans for regulating kthe brakes- 'depending upon the position ofthe cage vor skip hoisted bysaid HENRY VH. LOGAN. 

